FlexiChess
Prep smarter. Play sharper. Chess prep in your browser.
What it does
Search 10.4 million tournament games by idea — type "Petrosian's exchange sacs" and the matching games are on screen in seconds. Scout any opponent, find the leaks in your own games, and ask an AI coach that verifies every move it names. Free, in your browser.
Ask the games — 10.4M+ game database search (in seconds), player analysis, FSRS training, and a workbench you arrange yourself.
Search 10.4 million games by position, opening, pawn structure, middlegame theme or endgame pieces in seconds . Have your engine, opening explorer, and database side by side in a dynamic workbench customized to your liking. Use features such as automated opponent scouting, leakfinder to catch the mistake you keep repeating, and spaced-repetition training on your own repertoire. Upload and access your databases on the cloud from any browser regardless of operating system. Stack structures, endgames, openings, players, and ratings — “IQP + rook ending, White wins, 2600+” — and get the games that actually match. Any player, reported automatically — the openings they really play, how they score…from flexichess.com
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I built over the last two years a human-like neural network chess engine that tries to predict your rating from a single game. It automatically adapts to your play and tries to play like a human at your level would play, giving you a balanced game. At the core I’m using an AlphaZero / Leela Chess Zero style neural network that I have trained on 1 billion human games from the lichess.org open database. Around this network I have built a chess engine in Rust with algorithms that use the outputs from the NN to produce human-like moves at a given rating from beginner to world champion, as…
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